docstr: Inform the writer the chunking phase is finished.
docstr_tok: ["Inform","the","writer","the","chunking","phase","is","finished","."]
code: def _merge_no_wait(self, node_rank: Optional[int] = None) -> None:
      """Inform the writer the chunking phase is finished."""
      self._writer._merge_no_wait(node_rank=node_rank)
  
imports: import logging
  import os
  from dataclasses import dataclass
  from typing import Any, Dict, List, Optional, Tuple, Union
  from lightning.data.streaming.constants import _INDEX_FILENAME, _LIGHTNING_CLOUD_LATEST, _TORCH_GREATER_EQUAL_2_1_0
  from lightning.data.streaming.item_loader import BaseItemLoader
  from lightning.data.streaming.reader import BinaryReader
  from lightning.data.streaming.sampler import ChunkedIndex
  from lightning.data.streaming.serializers import Serializer
  from lightning.data.streaming.writer import BinaryWriter
  from lightning.data.utilities.env import _DistributedEnv, _WorkerEnv
  from lightning.data.utilities.format import _convert_bytes_to_int
label_desc: Use image node_id 12 for calling the Cache obj's underlying member method code with example usage: obj._merge_no_wait(node_rank) without return types